The best answer would be enzymes since they are protein molecules and help build it. Enzymes also take part in reaction.
Answer:
A shark's skeleton is made of cartilage , a type of strong but flexible tissue .Most other fish are covered in smooth , flat scales . A shark is covered in sharp , toothlike scales called denticles . Most other fish have flaps over their gills.
Explanation:
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In small intestine water is extracted from digested food.
